postgresql 两表关联更新操作

我就废话不多说了，大家还是直接看代码吧~

UPDATE 要更新的表
SET 字段1 = cqt.字段1,
 字段2 = cqt.字段2,
FROM
 数据来源表 cqt
WHERE
 要更新的表.bsm = cqt.bsm

补充：Postgresql 连表更新字段语法 update

下面这段sql本来目的是想更新条件下的数据，可是这段sql却更新了整个表的数据。sql如下：

UPDATE tops_visa.visa_order
SET op_audit_abort_pass_date = now()
FROM
 tops_visa.visa_order as t1
INNER JOIN tops_visa.visa_visitor as t2 
ON t1. ID = t2.order_id
WHERE
 t1.op_audit_abort_pass_date IS NULL
AND (
 t2. STATE = 'pch_abort_op_audit_pass'
 OR t2. STATE = 'pvd_abort_op_audit_pass'
)

正确的写法有多种，如下方法也能够实现正确的数据库修改：

UPDATE tops_visa.visa_order as t1
SET op_audit_abort_pass_date = now()
FROM
 tops_visa.visa_visitor AS t2
WHERE
 t1.ID = t2.order_id
AND t1.op_audit_abort_pass_date IS NULL
AND (
 t2. STATE = 'pch_abort_op_audit_pass'
 OR t2. STATE = 'pvd_abort_op_audit_pass'
)

频道导航

postgresql 两表关联更新操作

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